found 2 issues with the currently available documentation

[Sarge Borsch]

1:
On the page `https://www.gnupg.org/faq/whats-new-in-2.1.html`, there's a typo: "stroing", it should be "storing"

2:
The plain text version of the FAQ at `https://www.gnupg.org/faq/gnupg-faq.txt` doesn't send any charset header, and Firefox incorrectly assumes it's something other than Unicode, as a result the text is garbled in certain places.
Probably the same applies to some other plain text pages, I am not sure.